No description available.

A study of the granitic rock types along the Contact of the Timiskaming and Grenville subprovinces to the east of lake Timagami has been made. In the vicinity of the contact of the two subprovinces in the granites of the Grenville subprovince is a wide zone of faulting near which the rocks show wide spread cataclastic texture due to crushing. In this area the granite in the Grenville sub-province is very distinct from the Algoman granite of the Timiskaming subprovince and later than it. The granite in the Grenville subprovince is much fresher than the Algoman granite and unlike the Algoman is high in potash feldspar as determined by Rosiwal analyses. In the latter and other respects it strongly resembles the Killarney granite in Pardo and Dana townships and to the south along the north shore of Lake Huron. In Sisk township it contains a rather rare amphibole hastingsite which is also found in the Creighton granite of Killarney age. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

Manitouwadge, a copper-zinc-silver mining camp, lies 150 miles east of Port Arthur, Ontario, and 25 miles north of Lake Superior. A series of volcanics and sediments, now metamorphosed and migmatized to hornblende schists, quartz feldspar gneisses, and granite gneiss, underlies the Manitouwadge area. These have been folded into an overturned syncline which strikes east-west and plunges gently to the northeast. Three sets of faults are known with at least four periods of movement. The latest of these has offset the mineral deposits and some of the north striking diabase dykes. The two important deposits lie on the south limb of the syncline near the contact between granite and quartz feldspar gneiss. The Willroy property is adjacent to, and immediately west of, the Geco mine. The gneisses on the Willroy property exhibit a complete gradation from quartzite to iron rich hornblende gneiss, and are thought to be sediments that have been metamorphosed to a grade indicated by the amphibolite facies. Detailed mapping and drill hole correlation indicates the presence of several small folds in the east striking formations. All the sulphide deposits occur within individual formations where they are folded. The folds appear to be related to the major deformation, as are numerous pegmatite dykes which cut across the gneisses. The ore occurs in three tabular sulphide replacement bodies, with a strike parallel to that of the enclosing formations. These orebodies plunge to the east at 45 degrees, parallel to the plunge of the folds. The ore consists of pyrite, pyrrhotite, chalcopyrite, sphalerite, galena and tetrahedrite. Silver is present, and is apparently contained in the sulphide minerals. Although precise structural controls are not known, the sulphide deposits of the area all occur adjacent to small folds. Further work in the area might well be concentrated on outlining and prospecting similar structures. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

No description available.

No description available.

The Seabrook Lake carbonatite complex is one of the smallest of nine known carbonatite complexes in central Ontario. The complex, which is one-half square mile in area and pear-shaped in plan, consists of fenitized granite and breccia, mafic breccia, ijolite and related breccia, and carbonatite. The bulbous northern part of the complex consists of a plug-like core of carbonatite surrounded by mafic breccia and carbonatite dykes. The narrow southern part consists of ijolite and related breccia. Enveloping all of these rocks is a fenitized aureole which grades outward to unaltered granite that underlies much of the surrounding area. The carbonatite is composed of calcite with the following minor mineral, in decreasing order of abundance: goethite, microcline, magnesioriebeckite-riebeckite, magnetite-ulvospinel, apatite, hematite, pyrite, albite, biotite, chlorite, pyrochlore, brookite, sphene, ferroan dolomite (ankerite?), aegirine, chalcopyrite, wollastonite and quartz. The chemical constituents are as follows: Major CaO + CO₂ Minor Fe₂O₃, SiO₂, MgO, Nb₂O₅, SrO, BaO, Na₂O, K₂O, MnO, Al₂O₃, P₂O₅, S and H₂O. Trace Cu, Pb, Zn, As, Ce, Y, Li, Cr, Co, Ni, V, In, Zr, and Ti. The complex is believed to have formed by desilication and metasomatism of fractured and brecciated granite by a soda-iron-rich carbonatite magma of unknown origin. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

No description available.

No description available.

Steele, Bonis, and Scapa townships, in the District of Cochrane, Ontario, are underlain by a steeply inclined Precambrian metavolcanic-metasediment assemblage that is intruded by sills, dikes, stocks, and batholiths. The metamorphosed Bonis volcanics and Steele Lake volcanics are chiefly intermediate to basic lavas. The Scapa and Steele metasediments are composed mainly of metamorphosed greywacke, calc-silicate rocks, and iron-formation. Metamorphosed ultrabasic and basic intrusions occur in the Bonis volcanics and Scapa metasediments. The metasediments and Steele Lake volcanics show a regional metamorphic zoning relative to the Case batholith on the north margin of the area. Chlorite, biotite, garnet, and staurolite zones are distinguished over an area up to eight miles wide south of the batholith. The regional metamorphic zoning is attributed to intrusion of the Case batholith. The Bonis volcanics have been metamorphosed at their contact with the Sargeant batholith that underlies the southeast part of the area. The Bonis volcanics have acted as a "resistor" in protecting the metasediments from metamorphism by the Sargeant batholith. A narrow contact aureole occurs in the Scapa metasediments adjacent to the Scapa stock. Potash metasomatism and high water pressures have prevented the formation of alumina-rich minerals within the aureole. Diabase dikes of two ages cut all other rocks in the area. The easterly trending rocks of the metavolcanic-metasediment assemblage are locally deflected around the western end of the concordant Sargeant batholith. A spodumene-bearing pegmatite dike found in the Case batholith is of economic interest. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

No description available.